Compton Scattering cross section for inner-shell electrons in the relativistic impulse

G. STUTZ

NUCLEAR INSTRUMENTS AND METHODS IN PHYSICS RESEARCH B - BEAM INTERACTIONS WITH MATERIALS AND ATOMS

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2014 vol. 319 p. 8 - 16

0168-583X

Total Compton scattering cross sections and inelastic scattering factors for bound electron statesof several elements have been evaluated in the framework of the relativistic impulse approximation(RIA). The accuracy of different approximate expressions for the singly differential cross sectionwithin the RIA is discussed. Accurate evaluations of bound state scattering factors require the useof the full RIA expression. Compton scattering from K--shell electrons dominates over thephotoelectric absorption at higher energies. Energy values at which the Compton interaction becomethe main process of creation of K--shell vacancies are assessed. The role of binding effects inCompton processes at lower energies are clearly evidenced by the computed total cross sections.Calculated K--shell ionization total cross sections, defined as the sum of the photoelectricabsorption and the Compton scattering cross sections, are in good agreement with availableexperimental data. The total Compton cross section for the 2$s$ atomic orbital exhibits ashoulder--like structure, which can be traced back to the node structure of the 2$s$ wave function.